Could this be the issue, a SHA1 certificate, which has been disabled by Google Chrome now? How to fix this: NET::ERR_CERT_WEAK_SIGNATURE_ALGORITHM
Google search result list: NET::ERR_CERT_WEAK_SIGNATURE_ALGORITHM
Essence from the first link: It might by a Google extension which uses a weak certificate.
So the advice is disabling all extensions. See if the problem is gone. If it is, enable 1 extension at a time till the problem occurs again. The extension which has been re-enabled last, will be the one to blame and disable again.

HTH,
Karl

Old bugs good, new bugs bad! Updates are evil: might fix old bugs and introduce no new ones.